Deep Sky Object in Summer
M9 (Globular Cluster in Ophiuchus)

Date & Time: May 20 2005, from 26:26 to 26:35 JST(+0900)
Composed 3 shots with 4 minutes exposed
Optical: Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
Auto-guided with Meade LX200 Equatorial & Pictor 201XT
Digital Camera: Nikon D70 (Remodeled)
Location: Ooizumi, Hokuto city, Yamanashi pref.

Camera Settings: Recording Format...12bit CCD-RAW, converted to 8bit TIFF(3008×2000)
CCD Sensitivity...ISO800

M9 (NGC6333) / Globular Cluster, type VIII
R.A.17h 19m 12.0s (2000.0)
Dec.-18° 31' 00" (2000.0)
Apparent Size6.0'
Real Size45 light yrs.
Distance26,000 light yrs.
M9 is a compact globular cluster floating in the Milky Way about 3.5 degrees southeast of zeta Oph around underfoot of Serpent holder. Although the globular cluster has not so high stellar density, it has a diameter of at most 6 arc minutes. Small scopes cannot show you individual member stars although you will be able to appreciate a bright light spot like a nebula. This image shows you dark region without stars just southwest side of the cluster, it's a part of huge dark nebulosities distributed around the Milky Way.



Copyright(c) 2005 by Naoyuki Kurita, All rights reserved.
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